Timothy J Healy

US Patent:

7906697, Mar 15, 2011

Filed:

Mar 31, 2008

Appl. No.:

12/059717

Inventors:

Chunshe Cao - Houston TX, US
Michael P. Nicoletti - Houston TX, US
James R. Lattner - LaPorte TX, US
Jesse F. Goellner - Pittsburgh PA, US
Rutton D. Patel - Arlington VA, US
Timothy M. Healy - Centreville VA, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 2/04

US Classification:

585520, 585638, 585639, 585640, 502 38, 502 41, 423210, 422212, 23313 FB

Abstract:

This invention relates to efficiently regenerating catalyst particles by minimizing the formation of localized “hot spots” and “cold spots” in a regeneration zone. Specifically this invention relates to a method for controlling regenerator temperature in an oxygenates-to-olefins system, comprising the steps of: contacting an oxygenate feed in a reactor with a catalytically effective amount of molecular sieve-containing catalyst under conditions effective for converting said oxygenate to a product containing light olefins and forming a coked catalyst; contacting a portion of the coked catalyst in a regenerator, having a catalyst bed height (H), an inlet height (H), and an outlet height (H), with an oxygen-containing regeneration medium under conditions effective to at least partially regenerate the coked catalyst; and conducting a portion of the catalyst from the regenerator to a catalyst cooler to form a cooled catalyst portion, wherein His greater than H.